HowTo : Azure Linux VM OS partition expansion

  • Run followin Azure powershell,


$subscriptionId = "Your Subscription ID"
$rgName = “YourResourceGroupName
$vmName = “th-centos”
$vm = Get-AzureRmVM -ResourceGroupName $rgName -Name $vmName

PS C:\> Stop-AzureRmVM -ResourceGroupName $rgName -Name $vmName

OperationId :
Status : Succeeded
StartTime : 2016-11-28 PM 2:44:30
EndTime : 2016-11-28 PM 2:46:41
Error :

PS C:\> $vm.StorageProfile.OSDisk.DiskSizeGB = 130

PS C:\> Update-AzureRmVM -ResourceGroupName $rgName -VM $vm

RequestId IsSuccessStatusCode StatusCode ReasonPhrase
--------- ------------------- ---------- ------------
True OK OK

PS C:\Users\taelee> Start-AzureRmVM -ResourceGroupName $rgName -Name $vmName

OperationId :
Status : Succeeded
StartTime : 2016-11-28 PM 3:07:53
EndTime : 2016-11-28 PM 3:08:26
Error :


  • Ubuntu would not require the following, for CentOS in this example

[taehee@th-centos ~]$ hostnamectl
Static hostname: th-centos
Icon name: computer-vm
Chassis: vm
Machine ID: e57a6b05e3d34a59b561f002e224d65a
Boot ID: 7348830553774bbe90f54883d716ef2a
Virtualization: microsoft
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-327.18.2.el7.x86_64
Architecture: x86-64

[root@th-centos /]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): u
Changing display/entry units to cylinders (DEPRECATED!).

Command (m for help): p

Disk /dev/sda: 136.4 GB, 136365211648 bytes, 266338304 sectors
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000dd16b

Device Boot Start End Blocks Id System
/dev/sda1 * 1 3917 31456256 83 Linux

Command (m for help): d
Selected partition 1
Partition 1 is deleted

Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First cylinder (1-16578, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-16578, default 16578):
Using default value 16578
Partition 1 of type Linux and of size 127 GiB is set

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

[root@th-centos /]# shutdown -r -t 0
Shutdown scheduled for Mon 2016-11-28 06:35:04 UTC, use 'shutdown -c' to cancel.
[root@th-centos /]#
Broadcast message from root@th-centos (Mon 2016-11-28 06:34:04 UTC):

The system is going down for reboot at Mon 2016-11-28 06:35:04 UTC!


  • Log back in to "th-centos"

[root@th-centos ~]# xfs_growfs -d /dev/sda1
meta-data=/dev/sda1 isize=256 agcount=4, agsize=1966016 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=7864064, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=3839, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 7864064 to 33290440

[root@th-centos ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 127G 1.5G 126G 2% /
devtmpfs 1.7G 0 1.7G 0% /dev
tmpfs 1.7G 0 1.7G 0% /dev/shm
tmpfs 1.7G 8.3M 1.7G 1% /run
tmpfs 1.7G 0 1.7G 0% /sys/fs/cgroup
/dev/sdb1 50G 53M 47G 1% /mnt/resource
tmpfs 345M 0 345M 0% /run/user/1000

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